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Originally, USMC sniper rifle bolts were blued and serialized to match the rifle. But occasionally, bolts got replaced. And the blue finish on replacement bolts was not always consistent. The mis-matched serial number on the bolt is a concern. But, I note however, that the marking technique exactly matches that used by the USMC during the Korean War period. I am also aware that the USMC discontinued the practice of matching serialized bolts to rifles sometime after WWII. Many USMC service rifles today have mis-matched bolts. So while the mis-matched bolt is a concern, my concern is alleviated somewhat by the correct marking technique and matching period of use. I further note that the bolt is a B2 bolt. Many B2 bolts were issued to the USMC. A B2 bolt would be a prime candidate to be a replacement bolt for a sniper rifle. So, I have no doubt that the bolt was issued to the USMC.
To summarize: I agree with you that a 100% original M1903 USMC sniper rifle (as originally built) should have a blued bolt. I am however claiming that there's also the possibility that any M1903 USMC sniper received during a possible rebuild process a polished bolt.